Very recent IUE observations of 2 BL Lacertae orbits

Details Very recent IUE observations of 2 BL Lacertae orbits Very recent IUE observations of 2 BL Lacertae orbits

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984cfua.rept...10u&link_type=abstract

In its LHEA Contrib. to the Future Ultraviolet Astron. Based on Six Years of IUE Res. p 10-13 (SEE N84-25559 15-89)

Astronomy and Astrophysics

Astronomy

Bl Lacertae Objects, Continuous Spectra, Emission Spectra, Spectral Emission, Time Dependence, Broadband, Flux (Rate), Heao 1, Iue, Red Shift, Spectral Bands, Spectrum Analysis, Ultraviolet Spectroscopy, X Ray Sources, X Ray Spectra, X Ray Spectroscopy

Scientific paper

Spectroscopic observations of two BL Lacertae objects consisting of 2 spectra of 1218+304 and 12 spectra of MrK 421 are presented. Data were generated by the International Ultraviolet Explorer (IUE) and HEAO 1. The former BL object was never before observed with IUE, possibly because it is very faint, but the fact that it is an X-ray source, and a highly variable one, makes it particularly interesting. MrK 421 was observed many times before with IUE as part of a continuing monitoring program. The present observations indicate an intensity decrease of approximately 25% on a timescale of one month, with little or no associated spectral change. With one exception, the spectra of these two BL objects show no discrete features, and the continua are well fit by the power law models. The one exception is a long exposure of MrK 421 which showed a broad emission feature near 1580 A. The validity of this feature is not yet established.

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